1. Grate rind and squeeze juice from lemon. Place rind in a small bowl; cover and refrigerate. Remove olive pits; cut olives in half. Drain capers. Coarsely chop onion. Drain and chop tomatoes. Combine juice, olives, capers, onion, and tomatoes in slow cooker.2. Remove skin from chicken; sprinkle chicken with pepper. Heat skillet over medium-high heat. Add oil to pan; swirl to coat. Place half of chicken in pan. Cook 3 minutes on each side or until browned. Place chicken in slow cooker. Repeat procedure with remaining chicken. Cover and cook on low for 4 hours or until chicken is done.